Process of forming oven side walls



Sept. 16 1924.

F. W. MOFFAT PROCESS oF FORMING OVEN SIDE WALLS 2 sheetssheer 1 Filed Jan. 19. 1924 lllllulmm IHIHHHHHH.

INVENTCIR.

Spt. 16; 1924.

2 Sheets-Sheet 2 llll' m l||| m |||||l uw |ll l unlmnnmv g INVEN'TUR. iufm F.. w. MOFFAT- PROCESS OF FORMIG OVEN SIDE WALLS Filed Jan.' i9 1924 [Ullniumnu Patented Septs i6, 1924,

Unire eras entf aannemen w. Messer, or W'lEsroN. onraaidceuanaf Paocnss or romaine OVEN 'sinny wenns.

Application led January 19, 1924.1.. Serial No. 687,230."

To @ZZ whom may concern.'

Be it known that I, FREDERICK WV. Mor- FAT. ot ythe town otVVeston, in the county oi York, Province of Ontario, Canadakk a i reasons the ordinary side walls andledges are not entirely satisfactory, and my object is to provide a combined oven side wall and rack support which involves the use of a minimum of metal, which -makes an oven which will heat faster, which is easily and perfectly enamelled on both sides, which will not warp in the process oit enamelling or in use. I attain my object by constructing the p-arts as hereinafter described to produce a side in which substantially all the parts are formed of a single thickness of metal, in which the ledges are formed by hollow ribs open at the back, and in which the ribbed portion is bordered by plain margins.

The invention is illustrated in the accompanying drawings in which Fig. l is a plan view illustrating the first step in the production of an oven side wall in accordance with my invention;

Fig. 2 an end elevation of the same;

Fig. 3 a perspective detail illustratingthe method of closing the ends ot the hollow ribs forming the ledges; v

Fig. et a similar view showing a part of an end Vflange welded in place;

Fig, 5 a plan View ofthe completed oven side wall;

Fig. 6 a cross section of the same on the line 6 6 in Fig 5 showing also part ot the frame of the oven; and

Fig. 7 a sectional detail showing a modification of one ot the end flanges.

In the drawings like numerals of reterence indicate corresponding parts in the different figures.

In forming my improved oven wall I lirst take a rectangular sheet of suitable metal l, such as mild steehand crimp or corrugate it to form a series of hollowribs separatedhy grooves y These grooves` are preferably as nearly-rectangular as possible in cross section, and theiends e oi' their bottoms are substantially rectilinear and in alinement. vEither simultaneouslywith thetorination ot a hollow rib, o as an after step7 its ends are closedbyvioldingthem inwardly as seen particularly in Figs 3 and l t so "as to effect a substantially complete closure `thereet.` By1"substantially` Complete it is to be understoodthat no 'gaps or openings are lettzwhichwill notk be keiicectively sealed by the application of the protective coating hereinafter 4referred to.l

rlfhe next step in the construction ot the?" wall 'the yapplicationfof the flanges 5 and their welding to `the ends l ot the bottoms oit the grooves?y lVhile the precise method of welding is immateriah it is preferable to butt weld the flanges with or without the application of extraneous welding metal. ln this way, a substantially liush joint is obtained and the finished wall presents substantially the appearance ot having been made trom a single sheet with the ribs 2 pressed out theretrom. i

The flanges 5 will be variously shaped according to the 'form of the oven with which the walt is used. It is shown in Figs, a, 5 and 6 that one flange lies entirely in the planeet the bottoms ott the grooves 3, while the other is bent at right angles. In Fig. 7 the `flange 5 extends downwardly at right angles to the adjacent ends 4 of the bottoms of the grooves. After theflanges have been welded in place, the oven wall is coated with vitreous enamel and baked. This coating and baking may take place either before or after the oven wall is positioned inthe oven in which it is used:

The advantages of an oven wall constructed in accordance with my invention are numerous, A construction is thus produced which cannot be stamped from a single sheet of metal and yet the wall is in effect a unitary structure and at no place is there more than a single thickness of metal. rlhis tends to make the oven heat faster as there is less thickness of heat absorbing material inthe side walls than is usually found with ordinary constructions using two sheets. A. minimum amount ot metal is employed in the wall, which reduces the cost of construction. The interior of the hollow ribs being entirely open at the back, the Wall is readily enamelled on both sidesand the metal thusy perfectly protected from corrosion. As surplus enamel readily iovs off from all `parts of the Wall, objectionable trickles and smearsl of surplus vitreous enamel are avoided. A sheet formed in this mannerdoes not Warp ivhen'subjecte'd to the Vsidewall and racksupport, which consists iny crimping a metalsheet to for-m a series of "ribs separated by grooves, the ends of the bottoms of the grooves being lsubstantially rectilinear and in alinement, and then Welding'a sheet metal flange to said ends.

3. A process of forming a combined oven sidewall and rack support, which consists in crimping a metal sheet toy form a series of ribs separated by grooves, the ends 'of the bottoms of the grooves being substantially rectilinear and in alinement, and then butt Welding a sheet metal flange to said ends.

4. A process of forming `a combined oven side Wall and rack support, which consists in crimping a metal sheet to form a series ot' hollow ribs separated by grooves, the ends of the bot-toms of' the grooves being substantially rectilinear and in alinement, turning in the edges of the ends of the ribs to substantially close said ends, and then Welding a sheet metal flange to they edges of the ends of the bottoms of the grooves.

5. Av process of forming a combined oven side Wall and rack support, Which consists in crimping ametal sheet to form a series of holloiv'ribs separated by grooves, theends of' the bottoms of the grooves being substantially rectilinear and in alinement, turning in the edges of the ends of the ribs to substantially close said ends, then Welding al sheet metal flange to the edgesof .the ends of the bottoms of the grooves, and finally app ying a'. protective heat-resisting coating to both sides of the Wall. f

Signed at Toronto, Canada, this th day of January 1924.

FREDERICK vv. MoFFAT. 

